In mixing bowl, beat butter or margarine on medium speed of the electric mixer for 30 seconds.,______,Add flour to butter mixture.,Beat at low speed until well blended.,Stir in nuts, using about 1 tablespoon dough for each.,Shape dough into 1-inch balls.,Place on ungreased baking sheet. Bake in a 325° oven for about 20 minutes.,Remove to wire rack to cool, when cookies are cool gently roll them in powdered sugar to coat.,Makes about 4 dozen.